Insulator.



No. 843,259. PATENTED FEB. 5, 1907.

W. G. CLARK INSULATOR.

APPLICATION FILED JUL-1'20, 1905.

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Inventor: \A/A LTER G. (ZA/WK No. 843,259. PATENTED FEB. 5, 1907. W. G. CLARK.

INSULATOR.

APPL IUATION FILED JULY20,1905.

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Inventor: Wau- E Curm WW, 22W, M

Arm:

I No. 843,259 PATENTED FEB. 5, 1907.

W. G. CLARK.

INSULATOR.

APPLICATION FILED JULY20, 190s.

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3 2 E 17 ar 17 Z" VVJFVF No. 843,259. I

PATBNTED FEB. 5, 1907v W. G. CLARK.

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F2 A f? Inventor:

A t: 5% WMTER CAARK mm, 1.2mm, W fi' UNITED PATENT OFFICE.

WALTER G. CLARK. OF SEATTLE, WASHINGTON, ASSIGNOR TO THE CLARK ELECTRIC AND MANUFACTURING COMPANY, A CORPO R ATION OF NEW YORK.

INSULATOR.

Specification of Letters Patent.

Patented Feb. 5, 1907.

' Application filed July 20, 1905. Serial No. 270,4:63.

,IIIIPI'OVGHIGIHJS in Insulators, of which the draw lngs.

This invention relates to insulators for electric wires, more particularly l.igh-tension cables, having insulator-clamps; and the objects of the invention are to improve upon the construction and efficiency of such de vices, increase their strength and lessen tie chances of breakage, and prevent tlie strain on the wire from being thrown entirely upon the clamp.

Further objects of the invention will hereinafter appear; and to these ends the invention consists of an insulator for carrying out the above objects embodying ti 0 features of construction, combinations of elements, and arrangement ofparts, having the general mode of operation substantially as lereinafter fully described and claimed in tlis specification and shown in the accompanying drawings, in wl".ich

following is a specification, accompanied by Figure 1 is a top plan view of an insulator I and clamp embodying the invention. Fig. 2 is a side elevation of the same. Fig. 3 is a perspective view of one portion of tie clamp. Fig. 4 is a perspective view of tle cooperating portion tlereof. Fig. 5 is a perspective view of the two portions of ti e clamp arranged'to clamp tle ire, illustrating in w lzat manner the two portions cooperate and interlock. Fig. 6 is a transverse sectional elevation'of tle insulator and clamp on tl e line a: :r of Fig. 1, shoe ing ti o clamp in position in t e insulator. Fig. 7 is a top plan view of tl e insulator Wi'iil'fOIll) tle clam pf Fig. 8 is a longitudinal sectional view on line a. a. of Fig. 7. Fig. 9 is a transverse sectional view on line b b of Fig. 7. ',,Fig. 10 is a side elevation of a modified form of insulator clamp. Fig. 11 is a top plan view of tlie same. Fig. 12 is a perspective view of one of the duplicate cooperating portions of tlne clamp. Fig. 12* is a detail sectional view. Fig. 13 is a top Jan view of the modified form of insulator without the clamp. Fig. 114 is a longitudinal sectional view of the same, and Fig. 15 is a' transverse sectional view of ti. e same.

Referring to tl;e drawings, A represents an insulator constructed in accordance uith this invention and provided uith a cap B, wl ich maybe in one or more portions, in this instance tl;e'two parts, the body and cap, being preferably made all in one solid piece. Tie cap is provided uith a groove D to receive tie a ire E, and suitable means are provided for clamping the wire tightly and for preventing it from moving eitl: er vertically or horizont'allyin tlie insulator-cap.

According to this invention the insulatorcap is constructed to receive and hold a clamp which may be tightened up as desired and after being tightened cannot be removed from the insulator until untightened to release the wire.

According to the preferred form of the invention shown in Figs. 1 to 9, inclusive, both portions of the clamp can beapplied to the insulator-cap from the outside, because the groove D is widened at each side at the center, which enables the two members G and H of the clamp to be applied to the wire directly. The widened passage-way or cavity at the'central portion of the insulator has. .lateral cavities F to receive the members of the clamp.

The two members G and H of the clamp are adapted to interlock, and thus cooperate to clasp the wire. One member, as the member G, is provided with a screw-threaded tongue or projection I, wit-h which an aperture or slot J on the other member H cooperates. One member, as the member H, is provided with one or more tongues or lugs K, which enter and interlock with the slots or apertures L in the member G. Preferably, but not necessarily, the member G has a curved base or bottom O, which substantially fits the curved bottom Z of the insulator passage-way or cavity F, which is also recessed deeply enough at V to receive the member G and bring the inner surface Q of said 1nemher subs antially flush with the bottom of the a curved body R, which is concaved to receive the wire E and cooperate with the member G. In this instance the member G is provided with an upwardly extending portion S opposite the screw-threaded projection I to EI'OYiIIdG the slots L for the lugs K on the mem or A In Fig. 5 a perspective View is shown, illustrating in what manner the clamping members G and H interlock, from which it will be seen that the lugs K are of sufficient length to project beyond the slots L, thus affording means for locking the entire clamp in the insulator. The projections T of the member H also extend beyond the upright I and afford means for securing the clamp in position in the insulator.

In order to clamp the wire in position, the member G is first placed'inthe widened central cavity or passage-way in the cap of the insulator, the wire is then inserted in the groove D and placed upon the curved portion Qof the member G, and the clamping member H is then placed over the wire and on the member- G, as indicated in Fig. 6, in which case the lugs K extend into the recesses or undercut portions or cavities U beneath the projecting shoulders V of the insulator-cap, and thus prevent the clamp and wire from being withdrawn upwardly. A nut W is screwed down upon the scrcw-threaded projection I to secure the two clamping members together, and it will be seen that the projections T are seated below the top of the cap, and-thus aid in securely holding the wire in position. The widened cavity or i assage-way in he insulater-cap is similarly constructed on both sides of the center, so that the clamp may be insertedin either po'sitionthat isto say, it may be inserted in the position shown in Fig. 6 or: else the screw-threaded upright and nut may be on the left-handside as Fig. 6 is viewed instead of on the righthand side.- The clamp and cooperating. recessed portion of the cap are preferably so constructed that the projections K bear against the projections V on the cap when the clamp is tightened, thereby holding the wire firmly in position.

In the modified form of insulator and clamp shown iii-Figs. 10 to 15 the insulator and cap are illustrated in the same general relation as before. The groove D is widened at each side at the center of the cap and is undercut at F at the sides and ends to-rcceive the body portions B of. the clamping members G, which are substantial duplicates of each-other and adapted to cooperate one with the other, as indicated in plan view of Fig. 11. The widened passage-way or cavity has lateral cavities F for the clamp. In this instance the clamping members are so constructed that the clamp to contain the wire is first placed in position in the widened the faces being, show-n formed with compound curves. The nut L suitably locks the two cooperating" members G and 11 together. According to the construction of this inven tion the strain on the wire is taken by both the clamp and the insulator itself, and the clamps are constructed in such a substantial manner that they firmly hold the wire in place without liability of breaking. The membersof the clamps not only interlock with each other, but it will be seen that they also interlock with the insulator-cap to prevent either the clamp or wire from being re moved from the insulator without first either removing a portion of the insulator or unlocking the clamping members.

" Obviously some features of this invention may be usedwithout others, and the inven tion may be embodied in widely-varying.

forms. [herefore,- without limiting the in vcntlon to the devices shown-and descrlbcd and without enumeratingequivalents,I claim,

and desire to obtain by Letters Patent, the

7 following:

1. As a new article of manufacture, an insulator for wires formed with a groove in-its top for the wire, a widened cavity or passageway atthe central portion of the insulator extending to the top of the-insulator for tile inscrtion of a wire-holding clamp, andrecesses or undercut portions at eaclnsido of said-widened cavity, with projecting shoulders above said recesses for recei ing andre taining lugs on the clamp to hold it inplace.

2. As a new article ofmanufacture, an insulator for wires formed with a groove in its top for the wire, a widened cavity or passageway at the central portion of the top of the insulator, having lateral cavities extending to the top of the insulator for the insertion of the members of a wire-holdingclamp, and recesses or undercut portions at each side of said lateral cavities, with projecting shoulders above said recesses'for receiving and retaining projections on the clamping members to hold them in position.

3. As a new article of manufacture, an insulator for wires formed with a groove in its top for the wire, a widened cavity or passageway at the central portion of the top of the insulator having a curved, and recessed bot- IIO tom and lateral cavities extending to the l In testimony whereof I have signed this top of the lnsulator for the insertion of the speoifiozttlon 1n the presence of two subscribmembers of a suitable wlre-holdlng clamp, lng Witnesses.

and recesses or underoi t portions at eaph lVALTER G. CLARK. side oi the lateral cavities and OHQPPOSIEB l Witnesses: 7 sides of the central groove for reeelving the HARRY A. Wlnson clamping members to hold them in position. i THOS. J. CONRY. 

